Rock your socks for World Down Syndrome Day! WDSD is March 21st, help us celebrate on Friday, March 20th. Crazy or mismatched, wear whatever you choose and celebrate inclusion with GC SEPTA! March 21st (3-21) is internationally recognized as World Down Syndrome Day (signifying a third copy of the 21st chromosome). “Rock your socks” to raise awareness and create conversation about Down Syndrome, diversity and inclusion. “Rock your socks” is a reminder that all types, shapes and sizes of the same thing can be unique in their own way.